Cirrus-logic AN362 Bedienungsanleitung PDF herunterladen

Cirrus Logic, Inc.

http://www.cirrus.com

Application Note

CS5480/84/90 Measurement Accuracy

vs. IEC Standards

1. Introduction

Cirrus Logic’s CS5480, CS5484, and CS5490 energy measurement ICs benefit from on-chip, high-performance, 24-

bit ADC converters in conjunction with its digital calibration and compensation algorithms. This application note pres-

ents accuracy results from testing the CS5480. The CS5484 and CS5490 uses the same core technology as the

CS5480. Testing results of the CS5484 and CS5490 show nearly identical results.

The CS5480 has world-leading accuracy over an extensive, dynamic range. This application note cites measure-

ments of active energy, reactive energy, and I

RMS

load performance acquired from the CS5480 using three different

types of current sensor: Rogowski coil, current transformer (CT), and shunt. A comparison between the CS5480

measurements and the IEC 62053 standards is presented. This comparison shows that the CS5480 meets IEC

62053-22 class 0,2S standards for active energy and IEC 62053-23 class 2 standards for reactive energy. Compar-

ison with the ANSI C12.20 standard is not included in this application note because the ANSI standard is less strin-

gent than the IEC 62053 standard, so it is implied that the CS5480 meets it.

2. Test Setup

The following diagram illustrates the connections between the PPS400.3 power source, PRS400.3 power reference,

current sensor, CDB5480U board (+3.3V DC power supply), and a host PC.

Power Source

CS5480

VIN 1+

VIN 1-

CDB5480U

PPS400.3

Power Reference

PRS400.3

Energy Pulses

+3.3V DC Power Supply

+3.3V GND

USB

DO1

CDB5480U GUI

CAMCAL

for

WINDOWS

RS232

Current

Sensor

METER

SH2003

IIN1 -

IIN1 +

27n

1K100

27n

GND

IIN1-

IIN1+

V+

V-

GND

27n

LINE 1

GND

422 K 422K 422K422K

Figure 1. Test Setup Connection Diagram

AN362

MAR’12

AN362REV1

1 2 3 4 5 6 ... 15 16

Inhaltsverzeichnis

Seite 1 - Application Note

Seite 2 - • Phase compensation

AN36210 AN362REV14.3Accuracy Results for IRMS Load Current PerformanceFigure 9. IRMS Load Current PerformanceLoad Current (A)Current Dynamic Range (x

Seite 3 - = 2(80A) at 50Hz

AN362AN362REV1 115. Accuracy Test with Shunt, Un = 240V and Ib(max) = 2.5(100A) at 50HzA 100μΩ shunt is used as the current sensor. When the meter is

Seite 4 - = 2 (80 A) at 50 Hz

AN36212 AN362REV15.1Accuracy Results for Active Energy Load PerformanceFigure 11. Active Energy Load Performance vs IEC 62053-22 Class 0,2S StandardP

Seite 5

AN362AN362REV1 13Figure 12. Reactive Energy Load Performance vs IEC 62053-23 Class 2 StandardPower Factor Load Current (A) Current Dynamic Range (x:1

Seite 6 - 3.3Accuracy Results for I

AN36214 AN362REV15.2Accuracy Results for IRMS Load Current PerformanceFigure 13. IRMS Load Current Performance6. SummaryThe CS5480 supports three cur

Seite 7

AN362AN362REV1 157. Revision History Revision Date ChangesREV1 MAR 2012 Initial Release.

Seite 8

AN36216 AN362REV1Contacting Cirrus Logic SupportFor all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one neare

Seite 9

AN3622 AN362REV1The Cirrus Logic CDB5480U demonstration board and current sensor form a single-phase, two-wire energy meter.The CDB5480U software is i

Seite 10 - Load Current Performance

AN362AN362REV1 33. Accuracy Test with Rogowski Coil, Un = 240V and Ib(max) = 2(80A) at 50HzPulse PA3202NL is used as the current sensor. The secondary

Seite 11 - = 2.5(100A) at 50Hz

AN3624 AN362REV13.1Accuracy Results for Active Energy Load PerformanceFigure 3. Active Energy Load Performance vs. IEC 62053-22 Class 0,2S StandardPo

Seite 12 - = 2.5 (100 A) at 50 Hz

AN362AN362REV1 53.2Accuracy Results for Reactive Energy Load PerformanceFigure 4. Reactive Energy Load Performance vs IEC 62053-23 Class 2 StandardPo

Seite 13

AN3626 AN362REV13.3Accuracy Results for IRMS Load Current PerformanceFigure 5. IRMS Load Current PerformanceLoad Current (A)Current Dynamic Range (x:

Seite 14 - 5.2Accuracy Results for I

AN362AN362REV1 74. Accuracy Test with Current Transformer CT, Un = 240V and Ib(max) = 2.5(100A) at 50HzTaehwatrans TZ76V is used as the current sensor

Seite 15 - 7. Revision History

AN3628 AN362REV14.1Accuracy Results for Active Energy Load PerformanceFigure 7. Active Energy Load Performance vs IEC 62053-22 Class 0,2S StandardPow

Seite 16 - 16 AN362REV1

AN362AN362REV1 94.2Accuracy Results for Reactive Energy Load PerformanceFigure 8. Reactive Energy Load Performance vs IEC 62053-23 Class 2 StandardPo